Anticorrosive pigment preparation containing metal oxide-coated platelet adjuvant

Abstract

A pigment preparation comprising (i) 10-80% by wt. of a platelet-shaped substrate coated with a metal oxide, and (ii) 20-90% by wt. of an active pigment.

What is claimed is: 
     
       1. A pigment preparation comprising an organic binder containing (i) 10-80% by wt. of a platelet-shaped substrate coated with a metal oxide, and   (ii) 20-90% by wt. of an active pigment.   
     
     
       2. A pigment preparation according to claim 1, wherein the platelet-shaped substrate coated with a metal oxide is mica coated with titanium dioxide or iron oxide. 
     
     
       3. A pigment preparation according to claim 1, wherein the active pigment is a compound which is capable of converting primary corrosion products which form in defects of an organic coating into solid compounds which are stable to water. 
     
     
       4. A pigment preparation according to claim 1, wherein the active pigment is a material which binds hydroxide ions. 
     
     
       5. A pigment preparation according to claim 1, wherein the active pigment is zinc phosphate, zinc borate or calcium metaphosphate. 
     
     
       6. A pigment preparation according to claim 1, wherein the active pigment is a monomeric and/or polymeric, metal-free or metal-containing, chelate complex compound of formulae I or II: ##STR2## wherein A and B are each independently an aromatic or cycloaliphatic radical which optionally contain hetero-atoms and is optionally substituted by aryl, alkyl, halogen, oxygen-containing, sulfur-containing or nitrogen-containing groups, R 1 , R 2     R 3  and R 4  are H atoms or alkyl radicals, and   Me is Fe, Ni, Co, Mn, Bi, Sn, Zn or H 2 .   
     
     
       7. A pigment preparation according to claim 1, wherein the active pigment is a phthalocyanine, tetraarylporphyrin or a tetraazaannulene. 
     
     
       8. A pigment preparation according to claim 1, wherein the active pigment is a metaphosphate, bi- or triphosphate, silica gel, silicate, aluminosilicate or calcite. 
     
     
       9. A pigment preparation according to claim 1, wherein the organic binder has carboxyl group-containing polymer particles. 
     
     
       10. An anti-corrosion coating material comprising a pigment preparation according to claim 1. 
     
     
       11. An anti-corrosion coating material according to claim 10, containing a water-dilutable polymer dispersion. 
     
     
       12. An anti-corrosion coating material according to claim 10, containing an organic polymer dispersion. 
     
     
       13. A pigment preparation comprising an organic binder containing: (a) an active pigment; and   (b) a platelet-shaped substrate coated with a metal oxide in an amount effective to increase corrosion resistance of the active pigment.